1896. | NEW YORK ACADEMY OF SCIENCES. 99 
the forms examined, from the simple ileo-colic transition of 
Manis to the complete caecum of Tamandua. 
Manis longicaudata: Ileo-colis transition direct, marked by 
bend or tube, caliber of large and small intestine uniform. 
Cholepus didactylus: Transition direct, caliber of colon 
larger. 
Myrmecaphaga jubata: Transition direct, difference in caliber 
of colon and small intestine more marked. 
Tatusia novemcinta: Transition direct, colon dilated uni- 
formly, entrance of ileum central. 
Dasypus sexcinctus: Rudimentary bilateral colic ceca, en- 
trance of ileum central and intermediate. 
Arctopithecus marmoratus: Rudimentary cecum, entrance 
of ileum approaches lateral position, folds absent. 
Tamandua bivittata: Czcum and folds well developed, en- 
trance of ileum lateral. 
The arrangement of the blood vessels and the rudimentary 
ileo-czecal folds in this series indicate the early condition of the 
mammalian cecum as compared with the vascular and peritoneal 
arrangement of such forms as the Archoid group of carnivora, 
where the evidence points to the elimination of a former, cecal, 
intestinal appendage, during the evolution of the group. The 
paper also considered the respiratory and genito-urinary tracts 
of Arctopithecus marmoratus. 
The second paper was by Dr. O. 8. Strong on “ The Use of 
Formalin in Injecting Media.” The writer pointed out the ad- 
vantages of fixing whole brains by injecting in situ with forma- 
lin. Formalin (40 % formaldehyde) diluted with an equal vol- 
ume of water is injected into the cephalic vessels until it runs 
from the cut jugulars. After a few minutes the same quantity 
is again injected, and once or twice again after an elapse of fif- 
teen (15) to twenty (20) minutes. The brain is then removed 
and will be found to be completely fixed throughout. The 
swelling usually noticed in formalin hardened brains does not 
appear to take place when this method is employed. Besides 
